8 JAMES A. GRIEG. 
[SEC. ARCT. EXP, FRAM 
respectively. In specimens from Spitzbergen I have found the numbers 
to be 22—26/16--22. Accordmg to Tore. they are 29/23. In speci- 
mens from the Siberian Polar Sea Lecue found 23/14 teeth. Krause 
found 21/13 teeth in a specimen 31 mm. long from the Bering Sea. 
According to PosseLT moreover yoldia hyperborea may have as many 
as 38/32 teeth. 
The largest specimens measure: 
Rice Strait Long. 34.5 mm. Lat. 17 mm. Crass. 9.5 mm. 
— 315 , 16, 85, 
Gaasefjord 99 Oy 15.5, ae 
= % «i, 14.5 ,, ta % 
A right valve from Gaasefjord had a length of 31 mm. Possext 
gives the maximum size of this species as 45 mm. 
Yoldia hyperborea is not mentioned by either Posse.t or HAGe, in 
their treatises on the distribution of this species, as occurring in waters 
north of America. But as has been already remarked by Torext it must 
be this species which under the name of nucula sapotilla Reeve 
mentions as occurring in the Wellington Channel. 
Mytilus edulis, Line. 
Locality: 
July 20. 1898. Egedesminde. 
July 30. , Godhavn, about 6 m. 
The largest specimen has a length of 78 mm. 
Modiolaria laevigata, Gray. 
Locality: 
Aug. 18. 1898. Camp Clay, Cape Sabine, 4—10 m. 
Aug. 2%. ,, Bay near Rice Strait. 
Aug. 26. ,, - = ; 
July 29. 1899. The winter harbour, Havnefjord, 12 m. 
Sept. 22. ,, _ — _ , 16 m. 
July 25. 1900. — , about 20 m. Rocks and stones. 
July 2. ast: side of the entrance to Stordalen, Havnefjord, about 20m. Clay. 
July 30. a The entrance to Stordalen, Havnefjord. 
July 31. ‘ Round Vestre Sund, Havnefjord, 20—60 m. 
Aug. 3. , Fosheim Peak and the valley on the west side of Havnefjord. 4—40 m. 
Sept. 19. , Off Forvisningsdalen, Gaasefjord 4—40 m. Clay with small stones. 
Sept. 20. ,, The head of the Gaasefjord, 6—40 m. Clay with small stones. 
June 28. 1901. The entrance to Hvalrosfjord. 
July 8. “ Renbugten, about 20 m. 
July 9% 4 _ ‘ 
July 12. ma Bay near Landsend, about 35 m. 
Aug. 2. The head of the Gaasefjord, about 40 m. 
Aug. 
, about 14 m. 
